1STRCHR(3)                  Linux Programmer's Manual                 STRCHR(3)
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NAME

6       strchr, strrchr, strchrnul - locate character in string
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SYNOPSIS

9       #include <string.h>
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11       char *strchr(const char *s, int c);
12       char *strrchr(const char *s, int c);
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14       #define _GNU_SOURCE         /* See feature_test_macros(7) */
15       #include <string.h>
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17       char *strchrnul(const char *s, int c);
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DESCRIPTION

20       The  strchr() function returns a pointer to the first occurrence of the
21       character c in the string s.
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23       The strrchr() function returns a pointer to the last occurrence of  the
24       character c in the string s.
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26       The strchrnul() function is like strchr() except that if c is not found
27       in s, then it returns a pointer to the null  byte  at  the  end  of  s,
28       rather than NULL.
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30       Here "character" means "byte"; these functions do not work with wide or
31       multibyte characters.
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RETURN VALUE

34       The strchr() and strrchr() functions return a pointer  to  the  matched
35       character  or NULL if the character is not found.  The terminating null
36       byte is considered part of the string, so that if  c  is  specified  as
37       '\0', these functions return a pointer to the terminator.
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39       The strchrnul() function returns a pointer to the matched character, or
40       a pointer to the null byte at the end of s (i.e., s+strlen(s))  if  the
41       character is not found.
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VERSIONS

44       strchrnul() first appeared in glibc in version 2.1.1.
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ATTRIBUTES

47       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
48       tributes(7).
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50       ┌────────────────────────────────────────────┬───────────────┬─────────┐
51       │Interface                                   │ Attribute     │ Value   │
52       ├────────────────────────────────────────────┼───────────────┼─────────┤
53       │strchr(), strrchr(), strchrnul()            │ Thread safety │ MT-Safe │
54       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

57       strchr(),  strrchr():  POSIX.1-2001,  POSIX.1-2008,  C89,  C99,   SVr4,
58       4.3BSD.
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60       strchrnul() is a GNU extension.
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SEE ALSO

63       index(3),   memchr(3),  rindex(3),  string(3),  strlen(3),  strpbrk(3),
64       strsep(3), strspn(3), strstr(3), strtok(3), wcschr(3), wcsrchr(3)
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COLOPHON

67       This page is part of release 5.12 of the Linux  man-pages  project.   A
68       description  of  the project, information about reporting bugs, and the
69       latest    version    of    this    page,    can     be     found     at
70       https://www.kernel.org/doc/man-pages/.
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74GNU                               2021-03-22                         STRCHR(3)
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